Make it high enough so you don't bump your head on it.
Measure how tall you are... make sure that it is taller.
If you use a ladder, it should be relatively easy to accomplish.
Do it tomorrow...
OK, so seriously... If you want this answered, you need to be more specific! Where is your bar? What are the surrounding demographics? ((should be able to find info online)) How much traffic passes by? How big is the space? What sort of competition is nearby? etc...
Though some objectives are going to be obvious and automatic... NO DWI's, etc... Food/Beverage compliance others are not so obvious... Find good metrics... Find the driver for the metrics. Impact the driver. Measure the metric again.
Lather, rinse, repeat. It's easy!
If you'd like help in solving the dilemma, contact me! I'd be happy to help.